Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
  • H04B1/06—Receivers
  • H04B1/16—Circuits
  • H04B1/1607—Supply circuits
  • H04B1/1615—Switching on; Switching off, e.g. remotely
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
  • H04W52/02—Power saving arrangements
  • H04W52/0209—Power saving arrangements in terminal devices
  • H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
  • H04W52/0287—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level changing the clock frequency of a controller in the equipment
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
  • Y02D30/00—Reducing energy consumption in communication networks
  • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

• the exemplary and non-limiting embodiments of this invention relate generally to wireless communication systems, methods, devices and computer program products and, more specifically, relate to techniques for reducing power consumption.
• L2 layer 2 (medium access control, MAC)
• TTI transmit time interval
• E-UTRAN also referred to as UTRAN-LTE
• UTRAN-LTE has been under discussion within the 3GPP.
• a working assumption is that the downlink (DL) access technique will be OFDMA, and the UL technique will be SC-FDMA.
• a method comprising determining, based on a received network device resource allocation for an impending operational period, whether a power saving mode can be entered, and if the power saving mode can be entered, selectively controlling at least one of clock signals and power supply voltages of at least a baseband portion of a receiver.
• a computer readable medium encoded with a computer program executable by a processor to perform actions comprising determining, based on a received network device resource allocation for an impending operational period, whether a power saving mode can be entered, and if the power saving mode can be entered, selectively controlling at least one of clock signals and power supply voltages of at least a baseband portion of a receiver.
• an apparatus comprising a receiver comprising baseband circuitry; and a processor configured to determine, based on a received resource allocation for an impending operational period, whether a power saving mode can be entered, said processor further configured to selectively control at least one of clock signals and power supply voltages of at least the baseband circuitry if the power saving mode can be entered.
• an apparatus comprising means for determining, based on a received resource allocation for an impending operational period, whether a power saving mode can be entered, and means for selectively controlling at least one of clock signals and power supply voltages of at least a baseband portion of a receiver if the power saving mode can be entered.
• Figures 1 and 2 reproduce Tables 7.1.1.2.3.1-1 and 7.1.1.2.3.2-1, respectively, of 3GPP TR 25.814 and show DL scheduling information required by a UE and an UL scheduling grant for a UE, respectively.
• Figure 3 shows a simplified block diagram of various electronic devices that are suitable for use in practicing the exemplary embodiments of this invention.
• Figure 4 illustrates a portion of the UE 10 of Figure 3 in greater detail according to an exemplary embodiment of the invention.
• Figure 5 is a logic flow diagram that is illustrative of a method, as well as the operation of a computer program product and an apparatus in accordance with the exemplary embodiments of this invention.
• the exemplary embodiments of this invention provide a power optimization technique that is suitable for use in OFDMA and similar systems, such as EUTRAN.
• the exemplary embodiments of this invention in particular take advantage of a DL transmit frame format having a user equipment (UE) allocation table followed by data.
• the allocation table, or AT defines for the UE the resources allocated for the UE, in time and frequency, for a next TTI (e.g., for a next 5ms TTI).
• Figures 1 and 2 herein reproduce Tables 7.1.1.2.3.1-1 and 7.1.1.2.3.2-1, respectively, which show the downlink (DL) scheduling information required by a UE and the uplink (UL) scheduling grant for a UE, respectively.
• the Resource Assignment blocks For the purposes of describing the exemplary embodiments of this invention at least the DL scheduling information block shown in Figure 1 may be referred to as the DL allocation table (AT).
• downlink control signaling can include scheduling information for downlink data transmission, and scheduling grant for uplink transmission, and ACK/NAK in response to uplink transmission.
• the transmission of control signaling from these groups is mutually independent. For example an ACK/NAK can be transmitted to a UE regardless of whether the same UE is receiving scheduling information or not.
• downlink scheduling information is used to inform the UE how to process the downlink data transmission.
• the information signaled to a UE scheduled to receive user data is summarized in Figure 1.
• the category 3 information as illustrated in Figure 1 is transmitted for every TTI of data to the scheduled user or users. Further, both an asynchronous and synchronous hybrid ARQ operation for the transmission of this information has been submitted to the 3GPP standards body. [0019] Additionally, in relation to Figure 1 for a case of a multi-layer transmission to a UE, multiple instances of and/or parts of category 2 information and category 3 information may be required.
• 3GPP submissions include that information about multi-layer transmission can be in either 'resource assignment' or 'multi-antenna related information' as illustrated in category 1 and category 2 of Figure 1 , respectively. Further, it is noted that uplink scheduling grants are used to assign resources to a UE for uplink data transmission.
• a wireless network 1 is adapted for communication with a UE 10 via a Node B (base station) 12, which may be referred to herein as an eNB 12.
• the network 1 may include a network control element (NCE) 14.
• NCE network control element
• the UE 10 includes a data processor (DP) 1OA, a memory (MEM) 1OB that stores a program (PROG) 1OC, and a suitable radio frequency (RF) transceiver 1OD for bidirectional wireless communications with the Node B 12, which also includes a DP 12 A, a MEM 12B that stores a PROG 12C, and a suitable RF transceiver 12D.
• the Node B 12 is coupled via a data path 13 to the NCE 14 that also includes a DP 14 A and a MEM 14B storing an associated PROG 14C.
• At least the PROG 1OC is assumed to include program instructions that, when executed by the associated DP 1 OA, enable the UE 10 to operate in accordance with the exemplary embodiments of this invention, as will be discussed below in greater detail.
• That is the exemplary embodiments of this invention may be implemented at least in part by computer software executable by the DP 1OA of the UE 10, or by hardware, or by a combination of software and hardware.
• the various embodiments of the UE 10 can include, but are not limited to, cellular phones, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless communication capabilities, music storage and playback appliances having wireless communication capabilities, Internet appliances permitting wireless Internet access and browsing, as well as portable units or terminals that incorporate combinations of such functions.
• PDAs personal digital assistants
• image capture devices such as digital cameras having wireless communication capabilities
• gaming devices having wireless communication capabilities
• music storage and playback appliances having wireless communication capabilities
• Internet appliances permitting wireless Internet access and browsing, as well as portable units or terminals that incorporate combinations of such functions.
• the MEMs 1OB, 12B and 14B may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
• the DPs 1OA, 12A and 14A may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on a multi-core processor architecture, as non-limiting examples.
• general purpose computers special purpose computers
• microprocessors microprocessors
• DSPs digital signal processors
• processors based on a multi-core processor architecture, as non-limiting examples.
• the exemplary embodiments of this invention provide power saving techniques for mobile devices, such as those operated in an OFDMA system.
• the UE 10 includes an RF portion 11 and a BB portion 13.
• the BB portion 13 processes the received DL signal to provide digital data that can be operated on by the DP 1 OA.
• a portion of this digital data is descriptive of the AT 15 that is transmitted from the eNB 12, and that defines the UE 10 UL resource allocations (e.g., frequency sub-bands and times) for a next TTI.
• those circuit blocks operating in the frequency domain of the receiver BB 13 can be optimized for power consumption via, as non- limiting examples, clock gating, clock frequency scaling and/or by controlling the supply voltage.
• Figure 4 shows a plurality of control outputs 17 A, 17B, 17C from the DP
• the control output 17A is used for performing clock gating (selectively turning certain clock signals on and off), as well as for frequency scaling, such as reducing the frequency of certain clock signals. By turning off certain clock signals and/or reducing the frequency of others the power consumption of the circuitry that uses these clock signals is reduced.
• the control outputs 17B and 17C provide for selectively scaling (e.g., reducing) the power supply voltage(s) and/or selectively turning off certain power supply voltage(s) to certain BB circuit modules and functional units, respectively.
• the DP 1OA drives the control outputs 17A, 17B and 17C based at least in part on the content of the AT 15 for the next TTI, and possibly also in accordance with the currently used AMC.
• the DP 1 OA becomes aware, by operation of the program 1 OC, of which resource blocks in the frequency and time domains are allocated for the UE 10.
• a "micro-sleep" cycle may be initiated by one or more of clock gating/clock frequency scaling (control output 17A), and/or scaling down of the supply voltage (control output 17B) and/or powering down of unused circuitry (control output 17C).
• the micro-sleep cycle may be used at least between received pilots symbols, thereby achieving an approximately 30% saving in the digital BB portion 13.
• the micro-sleep cycle may only be used if there is no data to be processed in the TTI. It is also within the scope of the exemplary embodiments of this invention to decode only one or more OFDM symbols per TTI frame (e.g., Syslnfo, paging information data, which do not use resource blocks over the complete TTI), and to then enter the micro-sleep cycle during remaining non-pilot symbols. In general, then, the micro-sleep cycle may be used for all or a portion of the TTI.
• OFDM symbols per TTI frame e.g., Syslnfo, paging information data, which do not use resource blocks over the complete TTI
• the micro-sleep cycle may be used for all or a portion of the TTI.
• the exemplary embodiments of this invention provide a method, apparatus and computer program product(s), as in the method shown in Figure 5, to determine (Block 5A), based on a UE resource allocation for an impending operational period, such as a TTI, whether a power saving mode can be entered and, if so, (Block 5B) to selectively control at least one of clock signals and power supply voltages of at least a baseband portion of a receiver in order to reduce power consumption.
• an impending operational period such as a TTI
• Such software tools can automatically route conductors and locate components on a semiconductor substrate using well established rules of design, as well as libraries of pre-stored design modules.
• the resultant design in a standardized electronic format (e.g., Opus, GDSII, or the like) may be transmitted to a semiconductor fabrication facility for fabrication as one or more integrated circuit devices.
• the coupling or connection between the elements can be physical, logical, or a combination thereof.
• two elements may be considered to be “connected” or “coupled” together by the use of one or more wires, cables and/or printed electrical connections, as well as by the use of electromagnetic energy, such as electromagnetic energy having wavelengths in the radio frequency region, the microwave region and the optical (both visible and invisible) region, as several non-limiting and non-exhaustive examples.
• electromagnetic energy such as electromagnetic energy having wavelengths in the radio frequency region, the microwave region and the optical (both visible and invisible) region

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• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Mobile Radio Communication Systems (AREA)
• Circuits Of Receivers In General (AREA)
• Charge And Discharge Circuits For Batteries Or The Like (AREA)

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• 2008
  • 2008-02-28 WO PCT/IB2008/050725 patent/WO2008104951A2/en active Application Filing
  • 2008-02-28 US US12/072,835 patent/US20080205318A1/en not_active Abandoned
  • 2008-02-28 EP EP08719506A patent/EP2127102A2/de not_active Withdrawn

Non-Patent Citations (1)

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